JP2013064556A - Heat pump-type heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in a heat pump-type heat source machine in which a use-side device and a water-refrigerant heat exchanger in a refrigerating cycle are connected by a water pipe, that the number of devices is increased when a device for coping with control of an inlet temperature and a device for coping with control of an outlet temperature are independently prepared, which causes degradation of efficiency in manufacturing and distribution, and complication in management.SOLUTION: This heat pump-type heat source machine includes a stop temperature setting means for setting an inlet-side stop temperature and an outlet-side stop temperature, and an operation stop controlling means for stopping an operation of the refrigerating cycle when at least a water temperature at an inlet side of the water-refrigerant heat exchanger is over the inlet-side stop temperature, or a water temperature at an outlet side of the water-refrigerant heat exchanger is over the outlet-side stop temperature.

Description

  Embodiments of the present invention relate to a heat pump heat source apparatus that heats a heat medium such as water using a heat pump refrigeration cycle.

In a heating system in which heating is performed by supplying warm water to a load (use side device) such as floor heating or a fan coil unit, a heat pump heat source machine using air such as outside air as a heat source as a means for heating water It is used. In addition, such a heat pump type heat source device has begun to be used in order to keep the water temperature of the cleaning agent in the cleaning tank provided in the part cleaning process of the factory constant.
In such a heat pump type heat source device, a heat medium-refrigerant heat exchanger is provided in which a heat medium such as circulating water or a cleaning agent exchanges heat with the condensed refrigerant in the heat pump refrigeration cycle, and the medium passing through the heat exchanger is provided. It is heated to a predetermined temperature and supplied to the user side device. The supplied medium dissipates heat on the use side device side, becomes low temperature, and returns to the heat pump heat source device again. Thus, the heat medium flows through a circulation path formed between the use-side device and the heat pump heat source machine.

  As the usage-side equipment, as described above, various equipment such as floor heating, a fan coil unit, and a washing tank are connected. Moreover, even if the use side is the same type of equipment, there are various requirements for the specifications of the heat pump type heat source device according to the specifications and the use form of the use side equipment. When stopping the operation of the refrigeration cycle of the heat pump heat source machine, the medium temperature on the inlet side of the refrigerant-medium heat exchanger of the heat pump heat source machine (hereinafter referred to as inlet temperature control) and the outlet side medium after heating are used. There are cases where temperature is used (hereinafter referred to as outlet temperature control). (Refer to Patent Documents 1 and 2) Which of these controls is used is determined by the required specifications such as the usage form of the usage-side equipment and the allowable range of fluctuations in the medium temperature.

JP-A-3-144256 JP 62-61852 A

However, when each heat pump type heat source device corresponding to the inlet temperature control and the outlet temperature control is prepared, the number of models increases, and the manufacture and distribution become inefficient and the management becomes complicated.
In addition, once a heat pump heat source apparatus that employs either one of the controls is installed, there is a problem that the device must be replaced when a change in control is required in actual operation.

  According to the embodiment of the present invention, the heat pump type heat source device includes an inlet temperature sensor that detects a medium temperature on the inlet side of the heat medium-refrigerant heat exchanger, and a medium temperature on the outlet side of the heat medium-refrigerant heat exchanger. An outlet temperature sensor to detect, and stop temperature setting means for setting an inlet side stop temperature and an outlet side stop temperature are provided. An operation stop control means is provided for stopping the operation of the refrigeration cycle when at least one of the case where the inlet medium temperature exceeds the inlet side stop temperature or the case where the outlet medium temperature exceeds the outlet side stop temperature occurs.

The block diagram of the heating system which concerns on embodiment of this invention. The refrigerating cycle and control block diagram of the heat pump type heat source machine used for the heating system. The control flowchart of the heat pump type heat source machine.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 3. The structure of the heating system 1 using the heat pump type heat source apparatus 2 which concerns on embodiment of this invention is shown in FIG.

In the heating system 1, the heat medium supplied from the medium pipe 5 circulates in the usage-side equipment 4 such as floor heating, a fan coil unit, and a washing tank. Here, since water is often used as a heat medium in general, an example in which water is used as the heat medium will be described below. In the usage-side device 4, the heat of the hot water is radiated to perform predetermined heating or heating. The water (medium) pipe 5 is provided with a pump 3 on the way, and the water in the water pipe 5 is circulated by operating the pump 3. A heat pump heat source unit 2 is provided in series in the middle of the water pipe 5. The water pipe 5 forms a closed circuit in which the usage-side equipment 4, the pump 3, and the water (medium) -refrigerant heat exchanger (26 in FIG. 2) of the heat pump heat source device 2 are connected in series. By operating the pump 3, the water in the water pipe 5 circulates between the use side device 4 and the heat pump heat source machine 2. In addition, when the use side apparatus 4 is used as a cleaning tank, the cleaning liquid may be circulated to the heat pump heat source apparatus 2 as it is.
Further, in FIG. 1, a pump 3 that circulates water in a closed circuit of the water pipe 5 is arranged between the heat pump heat source device 2 and the use side device 4, but the installation position of the pump 3 is in the middle of the water pipe 5. It may be provided anywhere, and may be built in the heat pump type heat source unit 2.

  The low-temperature water that has flowed out of the use-side device 4 due to the operation of the pump 3 flows through the heat pump heat source device 2 in series. Here, if the heat pump type heat source machine 2 is operated, the water in the water pipe 5 is heated by the heat pump type heat source machine 2 until it reaches a desired temperature while circulating through the water pipe 5, and this heat is applied. Water (hot water) is sent to the use side device 4. As a result, warm water is supplied to the use side device 4, and the heat is radiated to perform heating or warming.

  The heat pump type heat source device 2 shown in FIG. 2 includes a heat pump type refrigeration cycle and a control device that controls the refrigeration cycle. The heat pump refrigeration cycle includes a compressor 24 that is variable speed driven by an inverter device 23, a four-way valve 25 that changes the flow direction of refrigerant, a water (medium) -refrigerant heat exchanger 26, an expansion valve 27, and a heat source side heat exchanger. 28, it is a general refrigeration cycle constructed by sequentially connecting refrigerant piping so as to pass through the four-way valve 2 again and return to the compressor 24.

  The heat source side heat exchanger 28 is, for example, a finned tube type air heat exchanger, and is provided with a propeller fan 29 for ventilating the heat exchanger. The four-way valve 25 is provided for a defrosting operation for melting frost formed by condensation of moisture in the air on the surface of the heat source side heat exchanger 28, but heat source side heat under high-temperature atmospheric conditions that do not form frost. If the exchanger 28 is used, the four-way valve 25 is unnecessary.

When the refrigeration cycle is operated, the refrigerant is compressed by the compressor 24, and the discharged high-temperature high-pressure refrigerant flows to the water-refrigerant heat exchanger 26 via the four-way valve 25. In the water-refrigerant heat exchanger 26, the water flowing through the water pipe 5 and the high-temperature high-pressure refrigerant in the refrigeration cycle exchange heat to heat the water.
In this embodiment, R410A, which is an HFC refrigerant, is used as the refrigerant of the refrigeration cycle of the heat pump heat source unit 2, but other appropriate refrigerants may be used.

  Next, the control device of the heat pump heat source machine 2 will be described with reference to FIG. The inverter device 23 that drives the compressor 24 and the fan motor 30 that drives the propeller fan 29 are controlled by a controller 21 as control means. The controller 21 includes a microcomputer and its peripheral circuits. The controller 21 includes an inlet temperature sensor 32 for detecting the temperature of the water pipe 5 on the inlet side of the water-refrigerant heat exchanger 26 (hereinafter referred to as inlet water temperature (inlet medium temperature) Tin) and water- An outlet temperature sensor 31 that detects the temperature of the water pipe 5 on the outlet side of the refrigerant heat exchanger 26 (hereinafter referred to as outlet water temperature (outlet medium temperature) Tout) is input. Furthermore, the controller 21 is connected to an operating device 22 which is an operating means that can be set by the user. The controller 21 receives the detected temperatures of the sensors 31 and 32 and the setting contents of the operating unit 22, and the controller 21 determines the rotation speed of the compressor 24 and the fan motor 30 based on the input data. ,Control.

  Further, a heat exchange temperature sensor 33 is provided in the vicinity of the refrigerant outlet pipe during the heating operation of the heat source side heat exchanger 28 to detect the refrigerant temperature (Te). Further, a temperature sensor 34 for detecting a heat exchange air temperature (To) is provided on the heat exchange air inflow side of the heat source side heat exchanger 28.

  These sensors 33 and 34 are also connected to the controller 21, and the controller 21 reads the detected temperatures Te and To. The detected temperatures of these sensors 33 and 34 are used to detect the frosting state of the heat source side heat exchanger 28. The controller 21 detects the frosting state based on the difference between the temperatures Te and To (To-Te) and the time change of the difference, and determines whether or not the frosting amount has reached the amount necessary for defrosting. If it is determined that defrosting is necessary, a defrosting operation is performed. If the defrosting operation is not necessary as described above, these sensors 33 and 34 are unnecessary.

  As shown in FIG. 2, the operation unit 22 that functions as an operation means has two types of up / down operation buttons 22 a and 22 b and an operation / stop button for instructing operation / stop of the heat pump heat source unit 2 on the surface. 22c is provided. The first up / down operation button 22a is for setting the target temperature Ts of hot water in the water pipe heated by the heat pump heat source device 2, and is operated by the user or the installer to set the target water temperature. Value is set. In the example of FIG. 2, Ts is set to 45 ° C.

  On the other hand, the second up / down operation button 22b is an operation button for setting an inlet side stop temperature Tsi (° C.) for stopping the refrigeration cycle, that is, the compressor, based on the water temperature on the inlet side. The second up / down operation button 22b is used by the user or installer to set the temperature difference Tx (° C.). The temperature difference Tx will be described in detail later, but the first up / down operation button 22a described above. The inlet-side stop temperature Tsi is calculated by a predetermined calculation combined with the target temperature Ts set by. In the example of FIG. 2, this temperature difference Tx is set to 3 ° C.

  Above the first up / down operation button 22a, a first liquid crystal display unit 22d as display means is provided, and the target temperature Ts set by the first up / down operation button 22a is displayed as a digital value. .

  On the other hand, a second liquid crystal display unit 22e as a display means is also provided above the second up / down operation button 22b, and the temperature difference Tx set by the second up / down operation button 22b is displayed as a digital value. Is done.

  The controller 21 reads the target temperature Ts and temperature difference Tx of the hot water set by the operating device 22, and at the same time, the inlet water temperature Tin detected by the inlet temperature sensor 32, the outlet water temperature Tout detected by the outlet temperature sensor 31, the refrigerant temperature Te, The air (outside air) temperature To is read. The controller 21 has the following means for controlling the heat pump heat source unit 2 using these data and the like.

(1) An outlet side stop temperature Tos for stopping the refrigeration cycle (compressor) from the set target temperature Ts of the hot water is set, and an inlet side for stopping the refrigeration cycle (compressor) from the target temperature Ts and the temperature difference Tx. Stop temperature setting means for setting the stop temperature Tis (2) The inlet water temperature Tin and the inlet side stop temperature Tis are compared, the outlet water temperature Tout and the outlet side stop temperature Tos are compared, and the inlet water temperature Tin exceeds the inlet side stop temperature Tis. Stop control means for stopping the refrigeration cycle (compressor) of the heat pump heat source unit 2 when at least one of the case where the outlet water temperature Tout exceeds the outlet side stop temperature Tos is detected.

(3) During the operation of the heat pump heat source device 2, the output frequency f of the inverter device 23 is changed in accordance with the difference ΔT between the target temperature Ts and the outlet water temperature Tout and the time change thereof, and the rotational speed of the compressor 24 is controlled. Heating amount control means for controlling the heating amount of the heat pump heat source machine 2.
(4) The frost formation state is detected based on the difference (To-Te) between the refrigerant temperature Te of the heat source side heat exchanger 28 and the air temperature To for heat exchange (To-Te) and its change over time, and the amount of frost formation is necessary for defrosting. A defrosting operation means for performing a defrosting operation when it is determined whether or not a definite amount has been reached and it is determined that defrosting is necessary.

  Here, a method for calculating various temperature set values in the stop temperature setting means in the present embodiment will be described.

  First, the outlet side stop temperature Tos is a value obtained by adding a predetermined value A (° C.) to the set target temperature Ts of hot water. That is, Tos = Ts + A. Next, the inlet side stop temperature Tis is a value obtained by subtracting the temperature difference Tx set by the second up / down operation button 22b from the calculated outlet side stop temperature Tos. That is, Tis = Tos−Tx. This value can also be calculated as Tis = Ts + A−Tx using the target temperature Ts and the predetermined value A (° C.).

  Here, the predetermined value A is a correction value set in consideration of heat radiation in the water pipe 5 from the heat pump type heat source device 2 to the use side device 4. The predetermined value A is stored in advance in a memory in the controller 1. Note that the predetermined value A may be set to 0 when the water pipe 5 from the heat pump type heat source device 2 to the user side device 4 is short or when the heat insulation is high.

  As described above, the difference between the outlet side stop temperature Tos and the inlet side stop temperature Tis is the temperature difference Tx. Here, when the amount of water (L / min) flowing through the heat pump heat source device 2 is constant, the temperature rise value of the water temperature due to the rated heating capacity of the heat pump heat source device 2, that is, the difference between the inlet water temperature Tin and the outlet water temperature Tout. Strictly speaking, it is slightly affected by the incoming water temperature, but is almost constant. When the temperature rise value of the water temperature in the rated heating capacity is expressed by B (° C.), the relationship between the inlet water temperature Tin and the outlet water temperature Tout is Tout = Tin + B. In the general heat pump type heat source device 2, the temperature rise value B is about 5 ° C. In other words, in a general heating system, the flow rate of the pump 3 and the rated capacity of the heat pump heat source device 2 are selected so that the system is established by heating the medium with this temperature difference B.

  The timing of the compressor stop by the stop control means for stopping the refrigeration cycle (compressor) of the controller 21 will be described. When the temperature difference Tx set by the second up / down operation button 22b is larger than B, from the condition of Tis = Tos−Tx and the normal stable state Tout = Tin + B, the outlet water temperature is normal. The inlet water temperature Tin reaches the inlet side stop temperature Tis before Tout reaches the outlet side stop temperature Tos. Therefore, in such temperature difference setting, the stop of the refrigeration cycle of the heat pump heat source unit 2 is controlled by the stop water temperature Tin by the stop control means of the controller 21.

  On the other hand, when the temperature difference Tx set by the second up / down operation button 22b is smaller than B, conversely, the outlet water temperature Tout is set to the outlet side before the inlet water temperature Tin reaches the inlet side stop temperature Tis. The stop temperature Tos is reached. Therefore, in such a temperature difference setting, the stop control means of the controller 21 controls the stop of the refrigeration cycle of the heat pump heat source unit 2 by the outlet temperature Tout.

Here, in the heat pump heat source apparatus 2 of the present embodiment, if the temperature rise value B is 5 ° C., the temperature difference Tx set by the second up / down operation button 22b is 3 ° C. as shown in FIG. (<B = 5 ° C.), Ts = 45 ° C., Tos = 45 ° C. + A, Tis = 45 ° C.−3 ° C. + A = 42 ° C. + A, and with the heating operation of the heat pump heat source device 2 The outlet water temperature Tout reaches the outlet side stop temperature Tos (= 45 ° C. + A) before the inlet water temperature Tin reaches the inlet side stop temperature Tis (= 42 ° C. + A), and the refrigeration cycle of the heat pump heat source machine 2 ( Compressor) is stopped. That is, the outlet water temperature Tout when the inlet water temperature Tin reaches the inlet side stop temperature Tis (= 42 ° C. + A) is Tout = Tis + B = 42 ° C. + A + 5 ° C. = 47 ° C. + A> 45 ° C. + A. The outlet water temperature Tout reaches the outlet side stop temperature Tos before Tin reaches the inlet side stop temperature Tis.
For example, when the temperature difference Tx is set to 7 ° C. (> B = 5 ° C.), Ts = 45 ° C., Tos = 45 ° C. + A, Tis = 45 ° C.−7 ° C. + A = 38 ° C. + A, With the heating operation of the heat pump heat source device 2, the inlet water temperature Tin reaches the inlet side stop temperature Tis (38 ° C + A) before the outlet water temperature Tout reaches the outlet side stop temperature Tos (= 45 ° C + A). The refrigeration cycle (compressor) of the heat pump heat source machine 2 is stopped. Therefore, when the temperature difference Tx is set larger than B, the inlet temperature control can be performed, and when the temperature difference Tx is set smaller than B, the outlet temperature control can be performed. For this reason, in one heat pump heat source machine 2, it becomes possible to switch between the inlet temperature control and the outlet temperature control according to the set value of the temperature difference Tx by the user.

  Further, the stop control means of the controller 21 is a heat pump heat source when detecting at least one of the case where the inlet water temperature Tin exceeds the inlet side stop temperature Tis or the case where the outlet water temperature Tout exceeds the outlet side stop temperature Tos. The refrigeration cycle (compressor) of the machine 2 is stopped. For this reason, even if a problem such as the inlet temperature sensor 32 and the outlet temperature sensor 31 dropping out of the mounting position should occur, the refrigeration cycle of the heat pump heat source machine 2 is finally performed with a normal sensor. Therefore, it is possible to prevent problems such as the water temperature rising abnormally or continuing operation without stopping forever despite the water temperature reaching the target value.

Here, if the temperature difference Tx is set to a small value such as 0 ° C., if a malfunction occurs in the outlet temperature sensor 31, the refrigeration cycle is stopped based on the detected temperature rise of the inlet temperature sensor 32. Since the problem arises that the outlet water temperature rises extremely far, it is not desirable to make it too low.
On the other hand, if the temperature difference Tx is set to a large value such as 10 ° C., the inlet water temperature Tin reaches the inlet side stop temperature Tis much earlier than the outlet water temperature Tout always approaches the outlet side stop temperature Tos. This will stop the refrigeration cycle. Here, since the compressor 24 of the heat pump heat source unit 2 is controlled by the inverter device 24 based on the outlet water temperature Tout, if the refrigeration cycle is stopped in a state where the outlet water temperature Tout is low, the inverter 24 Efficient operation by variable speed control cannot be fully demonstrated. Therefore, it is not desirable to set the temperature difference Tx to an extremely large value.
From this, the temperature difference Tx is set to a value between 2 ° C. and 8 ° C. when the temperature rise value B by the heat pump heat source device 2 is 5 ° C. It is desirable.

  Hereinafter, the operation of the heat pump heat source device 2 by the controller 21 based on the setting content in the operation device 22 will be described based on the control flowchart of the controller 21 in FIG. 3.

While the operation is set in the operation / stop button 22c, the controller 21 reads the target temperature Ts and the temperature difference Tx set in the operation device 22 in order to operate the heat pump heat source unit 2, and various temperature sensors. , The inlet water temperature Tin, the outlet water temperature Tout, the refrigerant temperature Te, and the air temperature To for heat exchange are read. In addition, if the stop is set in the operation / stop button 22c, the operation of the heat pump heat source apparatus 2 is stopped.
Subsequently, the inlet side stop temperature Tis and the outlet side stop temperature Tos are calculated from the target temperature Ts and the temperature difference Tx by the above-described calculation formula (step ST1).

  Subsequent to step ST1, the inlet water temperature Tin and the inlet side stop temperature Tis are compared (step ST2). If Tin> Tis (Yes in step ST2), there is little heat dissipation in the use side device 4, and the water circulation path It is determined that it is not necessary to heat the water, and the operation of the refrigeration cycle of the heat pump heat source unit 2 is stopped, that is, the compressor 24 and the fan motor 30 are stopped (step ST3). After stopping the refrigeration cycle in step ST3, in order to balance the pressure of the refrigeration cycle and to prevent frequent operation stop, a standby state is maintained in which the stop state is maintained for a predetermined time (for example, 3 minutes). (Step ST4). When a predetermined time has elapsed in step ST4, the process returns to the first step ST0 again.

  On the other hand, in step ST2, when the inlet water temperature Tin is lower than the inlet side stop temperature Tis (No in step ST2), the outlet water temperature Tout and the outlet side stop temperature Tos are compared (step ST5), and Tout> Tos. If it is determined that the outlet water temperature is too high (Yes in step ST5), it is determined that it is not necessary to heat the water in the water circulation path, the process proceeds to step ST3, and the refrigeration cycle of the heat pump heat source device 2 is determined. The operation is stopped, that is, the compressor 24 and the fan motor 30 are stopped (step ST3). Thereafter, similarly to the case of Yes in step ST2, the process returns to the first step ST0 via step ST4.

  Therefore, the refrigeration cycle (compressor) of the heat pump heat source device 2 is detected when at least one of the case where the inlet water temperature Tin exceeds the inlet side stop temperature Tis or the case where the outlet water temperature Tout exceeds the outlet side stop temperature Tos is detected. Is stopped.

  In the case where the inlet water temperature Tin does not exceed the inlet side stop temperature Tis and the outlet water temperature Tout does not exceed the outlet side stop temperature Tos, that is, in the case of No in step ST5, the temperature of the water supplied to the use side device 4 Therefore, it is determined that heating is necessary, and the refrigeration cycle of the heat pump heat source unit 2 is operated. That is, the compressor 24 and the fan motor 30 are operated (steps ST6 to ST8).

  Specifically, the output frequency f of the inverter device 23 that operates the compressor 24 is determined in steps ST6 and ST7, and the determined frequency output f is output from the inverter device 23 to the compressor 24 and the fan motor. Operation is performed so that 30 is a predetermined number of revolutions. First, in step ST6, the temperature difference ΔT is calculated by subtracting the outlet water temperature Tout from the target temperature Ts set by the operating device 22. Subsequently, in step ST7, the output frequency f of the inverter device 23 is calculated based on the temperature difference ΔT and the time change rate. For calculation of the output frequency f, for example, by PI control or the like, the output frequency f is determined by proportional integration with the temperature difference ΔT. Then, the inverter device 23 is controlled in the next step ST8 so that the calculated output frequency f is obtained.

  As a result, if the difference ΔT between the target temperature Ts and the outlet water temperature Tout is large, the output frequency f increases and the rotational speed of the compressor 24 increases, thereby increasing the heating capacity of the heat pump heat source unit 2 and the difference ΔT can be small. For example, the output frequency f is decreased, the rotational speed of the compressor 24 is decreased, and the heating capacity of the heat pump heat source apparatus 2 is decreased. For this reason, the heating operation according to the heat load of the use side apparatus 4 can be implemented.

Subsequent to step ST8, it is determined whether or not the defrosting operation is necessary. First, the difference (To-Te) between the refrigerant temperature Te and the air temperature To and its time change are calculated (step ST9). It is determined whether or not the calculated data matches a predetermined defrosting requirement (step ST10). Here, if it is determined that defrosting is necessary, the defrosting operation of the refrigeration cycle is executed (step ST11). During the defrosting operation, it is determined whether or not the defrosting operation is completed (step ST12). Until the defrosting operation is completed (NO in step ST12), the defrosting operation is continued and completed (YES in step ST12). Return to ST0 and return to heating operation. The determination of the completion of defrosting uses, for example, the defrosting operation time (7 minutes), the temperature rise of the refrigerant temperature Te, or the like.
On the other hand, when it is determined in step ST10 that defrosting is unnecessary (No in step ST10), the process returns to step ST0 and repeats each step again.

Here, returning to FIG. 2, the operation of the refrigeration cycle will be described. Here, the pump 3 for circulating the water in the water pipe 5 is always in operation.
During the heating operation, the refrigerant flows in the direction of the solid line arrow described beside the piping of the refrigeration cycle shown in FIG. First, when the compressor 24 is operated, the refrigerant that has been compressed to a high temperature and high pressure passes through the four-way valve 25 and flows into the water-refrigerant heat exchanger 26. The water-refrigerant heat exchanger 26 functions as a condenser, supplies the heat of the refrigerant to the water flowing through the water pipe 5, heats the water, and the refrigerant itself condenses into a liquid refrigerant. This liquid refrigerant expands to low pressure and low temperature when passing through the expansion valve 27, and flows into the heat source side heat exchanger 28 that functions as an evaporator. In the heat source side heat exchanger 28, the refrigerant exchanges heat with the air blown by the propeller fan 29, takes heat in the air, evaporates into a gas refrigerant, and passes through the four-way valve 25 to the compressor 24. Return and repeat.

  On the other hand, as shown in FIG. 1, the water flowing in the water pipe 5 becomes low temperature in the use side device 4 and flows into the water-refrigerant heat exchanger 26 through the water pipe 5. Since the water-refrigerant heat exchanger 26 functions as a condenser, the water flowing into the water-refrigerant heat exchanger 26 from the water pipe 5 exchanges heat with a high-temperature refrigerant in the water-refrigerant heat exchanger 26. It is heated to a high temperature. After that, it flows out from the outlet of the water-refrigerant heat exchanger 26 and flows to the user side device 4 through the water pipe 5 and the pump 3. In the use side apparatus 4, heating or heating is performed using the water which became high temperature. After that, the heat is radiated by the use side device 4 and the water whose temperature is lowered flows again into the water-refrigerant heat exchanger 26 of the heat pump heat source device 2.

  In the present embodiment, the user or the installer (operator) operates the operating device 22 of the heat pump heat source machine 2 to set the temperature difference Tx, and the entrance mainly depends on the set temperature of the temperature difference Tx. It is possible to select whether to stop the heating operation of the heat pump heat source device 2 due to a rise in the water temperature or to stop the heating operation of the heat pump heat source device 2 due to an increase in the outlet water temperature. For this reason, although it is the same heat pump type heat source device 2, it is possible to select the heating operation stop mainly by the inlet water temperature and the heating operation stop by the outlet water temperature by the temperature difference Tx setting, and the versatility of the heat pump type heat source device 2 Can be increased.

  Furthermore, even when a malfunction occurs in either the inlet temperature sensor 32 or the outlet temperature sensor 31 and accurate temperature detection cannot be performed, the operation of the heat pump heat source apparatus 2 is finally performed according to the detected temperature of the normal sensor. Can be stopped, and the reliability and safety of the equipment can be improved.

  In the present embodiment, the set temperature Ts set by the first up / down operation button 22a of the operating device 22 is used as it is as the set temperature for determining the output frequency of the inverter device 23. However, when the set temperature Ts in the operation device 22 is set as the target value of the water temperature in the usage-side device 4, the usage-side device 4 radiates warm water and the temperature decreases. It may be necessary to set a target value. In order to deal with such a situation, the set temperature Ts set by the first up / down operation button 22a is not set to the target value of the outlet water temperature Tout of the water-refrigerant heat exchanger 26 as it is, but the outlet water temperature is changed. As the control target value, a slight correction value α (> 0) may be added to the set temperature Ts so that Ts = Ts + α. In this case, the new set temperature Ts = Ts + α is also used as the set temperature Ts used in the calculation of the outlet side stop temperature Tos and the inlet side stop temperature Tis.

  Moreover, as already explained, it is not preferable in terms of operation control of the heat pump heat source device 2 to set an extremely large value or a small value for the temperature difference Tx set by the operator or the installer. For this reason, the temperature difference Tx that can be set by the operation of the second up / down operation button 22b of the operation device 22 is within the range of values obtained by adding and reducing in advance a predetermined value to the temperature rise value B by the heat pump heat source unit 2. You may restrict to.

  The present invention is not limited to the above embodiment. Furthermore, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments of the present invention. For example, you may delete some components from all the components shown by embodiment of this invention. Furthermore, you may combine the component covering different embodiment suitably.

DESCRIPTION OF SYMBOLS 1 ... Heating system, 2 ... Heat pump type heat source machine, 3 ... Pump, 4 ... Utilization side apparatus (load), 5 ... Water piping, 22 ... Operation device, 21 ... Controller, 23 ... Inverter device, 24 ... Compressor , 26 ... water-refrigerant heat exchanger, 28 ... heat source side heat exchanger, 29 ... propeller fan, 30 ... fan motor, 31 ... outlet temperature sensor, 32 ... inlet temperature sensor

Claims (1)

In a heat pump heat source machine in which the user side equipment and the medium-refrigerant heat exchanger in the refrigeration cycle are connected by heat medium piping,
An inlet temperature sensor for detecting a medium temperature on the inlet side of the medium-refrigerant heat exchanger;
An outlet temperature sensor for detecting a medium temperature on an outlet side of the medium-refrigerant heat exchanger;
Stop temperature setting means for setting the inlet side stop temperature and the outlet side stop temperature;
An operation stop control means for stopping the operation of the refrigeration cycle when at least one of the case where the inlet medium temperature exceeds the inlet side stop temperature or the case where the outlet medium temperature exceeds the outlet side stop temperature occurs. A heat pump heat source machine characterized by comprising:

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